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TypeScript Academy · Lesson

Shared Types Package Strategy

Create a dedicated types package consumed across the monorepo.

Why a Shared Types Package?

Sharing types across frontend and backend eliminates drift between API contracts. A single source of truth means compile-time errors when the API shape changes.

// packages/types/src/index.ts
export interface User { id: string; name: string; email: string; }
export interface ApiResponse<T> { data: T; error?: string; }

Package Structure

Keep the types package minimal: just type exports, no runtime logic. This keeps it side-effect-free and tree-shakable.

packages/types/
├── src/
│   ├── index.ts      # re-exports all
│   ├── user.ts
│   ├── product.ts
│   └── api.ts
├── tsconfig.json
└── package.json

All lessons in this course

  1. TypeScript Project References Explained
  2. pnpm Workspaces with TypeScript
  3. Shared Types Package Strategy
  4. Incremental Builds and Cache in Monorepos
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